Carbureter.



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nr. A. Bassora, or IuDrAnAroLrs, INDIANA, Assrenon To THE .WHEELER-scannen C i. BUBETER. C0., 01E' INDIANAPOLIS, INDlA'NA, A CORPORATION 0F INDINA.

CBURETER.

naartoe.

Specification of Letters Patent.

Patente Apr., 3, 191'?.

Application iled January 5, `191.6. Serial No. 70,350.

State of Indiana, have invented a new and' useful Carbureter, of which the following is a specification. l A

It is the object of my invention to provide a carbureter which will produce an intimate mixture of -air and fuel; which lwill automatically reduce the size of the supply passage for the primary air when the suction in the carbureter is light, as when the engine is idling, which l do by av floating choker movable verticallyalong the Venturi tube by such suction; which has both an au-' tomatic auxiliary air valve and an automatic primary air valve, the latter of which 1 provide by the aforesaid choker; which has a fuel valve which is in alinement' with the auxiliary air valve and is moved inthe same direction as the auxiliary air valve for opening or closing, and has a readily accessiblev adjusting mechanism for relatively adjusting said two valves; and which has a single valved air inlet supply passage for both primary and secondary air, whereby a single specialsupply of air may be used, as

when the air is heated, and may bev oon-` trolled by a single valve.

My present invention is in some parts an improvement on the generic invention set forth in the co-pending application of James B. Funk, Ser. No. 70,332, of even filing date herewith.

The single ligure of the accompanying drawing is a central vertical section through a carbureter embodyin my invention.

'llhe main body 10 o the carbureter has a depending tube 11 which discharges up wardly through a sheet metal Venturi tube 12 into a mixing chamber'13 from which there'is a lateral outlet tube 14 provided with a butterfly throttle valve 15. A gasolene bowl 16 surrounds the tube 10, and is provided with the usual float 17 and floatoperated inlet valve 18 for maintaining substantially constant the gasolene level= in the bowl. The gasolene, or other fuel, is supplied from the bowl 16 through opeirings 19 to the hollow central boss 20, in which is screwed a vertically extending nozzle tube 21 having a vertical vhole throughout its length and lateral dischargel openings 22 at .beyond the upper end the contracted portion of the Venturi tube .12. A long-taper conical valve 23 having its small end upward is mounted in the vertical hole in the nozzle tube 21, and coperates with the walls of the hole below the discharge openings 22 to control the amount 0f fuel discharged. This valve 23 -is springpressed upward by a compression spring 24 having its lower part of a draining pet cock 25 screwed into the closed lower end of the tube 11. From the upper end of the valve 23 projects a 27, the guide stem 26 and push rod 27 having 'a sliding fit in the vertical hole in the upper part of the fuel nozzle 23.

The upper end of the push rod 27.l projects of the fuel nozzle 21 and bears against the under surface of an adjustable abutment 30 carried by an automatic air valve 31 which opens-downward into the mixing chamber 13 and provides a variable air inlet thereinto from the airsupplypassage 32, in the inlet end of which may be ya control valve 33. The valves 31 and 23 are' in alinement, and both open by downward movement. A bypass 34 con- .nects the inlet passage 32 to the upper end of the'tube 1l, so that if for any reason spe` cial air is desired, such as heatedA air for inpasses up from the Venturi tube 12 and the secondary air which is controlled by the auxiliary air valve 31. Thus the valve 33 controls both primary and secondary air, so that by closing or partly closing the valves 33, the total air supply is reduced and a richer mixture is obtained.

The valve 31 has a peculiar construction and mounting, and there is a peculiar form of adjusting means for the abutment 30. The valve 31 is fixed on the lower end of a tube 40, on the upper end of which is'fixed a dash pot piston 41 which is vertically slidable in a dash pot cylinder 42 formed in the wall 43 of the cap piece which fits on the main body member 10 and has formed with in it the air inlet passage 32 and the valve seat 44 for the auxiliary air valve 31. The valve 31 and piston 41 are spring-pressed upward by a compression spring 45 which surrounds the tube 40 and acts between the'piston 41 and a sheet metal shell 46 which is end seated in the upperv guide stem 26, -upon which rests a push rod -held in place by .inwardly projecting screws extending flat tongue 49 which has a sliding iit in a vertical slot or notch 50 in the lower end of a vertical rod 51 having a. knurled operating head 52 at its upper end and outside the wall 43. The rod 51 is'mounted in a tube 53, which has a sliding fit within and serves as a guide for the tube 40. The tube 53 is suitably held rigidly in place, as by soldering; and the rod 51 is held vertically 1n place by a spring-pressed ball 54 which is spring-pressed through a hole inthe tube 53 into a circumferential notch 55 in the rod 51 near its upper end. By turning the knurled head 52, the rod 51 and abutment 30 .are also turned, but since the tube 40 and valve 31 are prevented from turning by the pin 48 this turning of the abutment 30 causes it to travel along its screw-threaded mounting in the lower end of the tube 40 and thereby varies the vertical height of theA under surface of such abutment relatively to the valve 31. This adjustment provides for a relative adjustment between the auxiliary air valve 31 and the vfuel valve 23, thus providing for different fuel valve openings for a given auxiliary air valve opening.

Mounted on the reduced upper end of the fuel nozzle 21 is a. sliding tubular member or choker 60, which is drawn upward by the flow of primary air as the vacuum in the carburete'r increases and descends into the Venturi tube to diminish the passageway therethrough when the vacuum in the carbureter decreases. The downward movement of the choker 60 is limited by a shoulder 61 formed on 'the fuel nozzle 23 at about the level of the fuel' discharge openings 22, and when the choker 60 rests on this shoulder 61, which occurs when the engine is idling or at rest, the passageway through the Venturi tube 12 is very small, so that the flow of primary air is decreased materially relatively to the flow of fuel, and thus the mixture is made richer, which compensates or over-compensates for the inward leakage of air due to the greatly increased suction of the engine itself, for the vacuum varies inversely on opposite sides of the throttle 15 as such throttle is closed. The upward and downward movement of the choker 60 'thus controls the effective size of the Venturi tube 12, so as to control the iiow of primary air through such Venturi tube, and thus the choker (SO is in effect an automatic primary air valve. The choker 60 is made of such weight and size that it remains raised during the normal operation of the engine under load, and only descends when the engine is slowed down or stopped or the throttle 15 is nearly or completely turi tube 12 past the fuel discharge openings 22, picking up fuel as it passes, this mixture of prlmary air and fuel being discharged upwardly lnto the mixing chamber 13. The

4remainder of 'the'air drawn into the inlet passage 32 passes bythe auxiliary air valve 3l, the amount of such remainder depending upon the opening of such auxiliary air valve, and thus enters downwardlyvinto the mixing chamber 13. Thus the auxiliary air passing downwardly into the mixing chamberi13 collides violentlywith the mixture of primary air and fuel entering upwardly into such mixing chamber, producing a very considerable turbulence. This turbulence causes an intimate mixing of the fuel and air; and this intimate mixture is discharged through the lateral outlet 14, past the throttle valve 15, and into the inlet manifold of the associated engine, which manifold is connected in any suitable manner with the outlet 14. As the vacuum in the carbureter varies, the auxiliary air valve 31 is drawn down or allowed to rise, and by reason of the push rod 27 and valve stem 26 causes a similar downward or upward movement of the fuel valve 23, so as to vary the fuel supply in the same sense as the air passing the auxiliary air valve 31. As already explained, thepositions of the auxiliary air valve 31 and the fuel valve 23 may be relatively varied by turning the knurled head 52, so as to vary the size of the fuel supply opening for a given auxiliary air supply opening. The choker 60 also rises and falls to control the size of the primary air passage through the Venturi tube 12, as alreadyexplained, but rises practically to the top of its movement before there is any material downward or opening movement of the auxiliary air valve 31 and the fuel valve 23.

I claim as my invention:

1. In a carbureter, the combination of a mixing chamber, alined fuel and air inlet valves, each of which has a tendency to move toward closed position, said air inlet valve being movable against such tendency by suction in the mixing chamber, said air inlet valve comprising a disk valve member and a tubular stem member, means for preventing said valve member and stem member from turning while permitting them to move longitudinally, an abutment having a screwthreaded mounting in said tubular stem member, a rotatable rod projecting into said tubular stem member and lhaving a tongue and slot connection with said abutment, so that the turning of the rod also turns' the Lea-.atea :la

abutment in its screw-threaded mounting, and a push rod bearin against said abutment and acting on sai fuel valve.

2. In a carbureter, the combination of a mixing chamber, alined fuel and air inlet valves, each of which has a tendency to move toward closed position,'said air inlet valve being movable against, such tendency by suction in the mixing chamber, said air inlet valve comprising a disk valve member and a tubular stem member, means for preventing said valve member and stem member from turning While permitting them to move longitudinally, an abutment having a screwthreaded mounting in said tubular stem `member, a rotatable rod projecting into said tubular stem member and having a tongue and slot connection with said abutment, so that the turning of the rod also turns the abutment in its screw-threaded mounting, a push rod bearing against said abutment and acting on said fuel valve, and a fixed guide sleeve surrounding said rotatable rod and on which said tubular stem member of said air valve has a sliding fit.

3. lln a carbureter, the combination of a mixing chamber, alined fuel and air inlet valves, said air inlet valve comprising a disk Valve member and a tubular stem member, means for preventing said valve member and stem member from turning while permitting them to move longitudinally, an abutment having a screw-threaded mounting in said tubular stem member, a rotatable rod projecting into said tubular stem member and having with said abutment a connection which permits relative longitudinal movement but transmits rotary movement from said rod to said abutment, so that the turning of the rod also turns the abutment in its screw-threaded mounting, and a push rod bearing against said abutment and acting on said fuel valve.

4. lln a carbureter, the combination of 'a mixing chamber, alined fuel and air inlet valves, said air inlet valve comprising a disk valve member and a tubular stem member, means for preventing said valve member and stem member from turning While permitting them to move longitudinally, an abutment having a screw-threaded mounting in said tubular stem member, a rotatable rod projecting into said tubular 'stem member and having with said abutment a connection which permits relative longitudinal movement but transmits rotary movement from said rod to said abutment., so that the turning of the rod also turns the abutment in its screw-threaded mounting, a push rod bearing against said abutment and acting on said fuel valve, and a fixed guide sleeve surround ing said rotatable rod and on which said tubular stem member of said air valve has a sliding fit.

5. In a carbureter, the combination of a mixing chamber, alined fuel and air inlet valves, said air inlet valve comprising a disk valve member and a tubular stem member, means for preventing said valve member and stem member from turning While permitting them to move longitudinally, an abutment having a screw-threaded mounting in said tubular stem member, a rotatable rod projecting into said tubular stem member and having with said abutment a connection which transmits rotary movement from Said rod to said abutment, so that the turning of the rod also turns the abutment in its screwthreaded mounting, and a push rod bearing against said abutment and acting on said fuel valve.

In Witness whereof, I have hereunto set my hand at Indianapolis, llndiana, this twenty-eighth day of December, A. D. one thousand nine hundred and fifteen.

` EARL A. BESSOM. 

